Floor tiles material - match size for multiple rooms in house
For a floor material, there's no need to use UVs.

Use the position vector on the geometery node to get an even (world space) mapping for the floor. You can then just use box mapping and adjust the scale in the material. It will be applied at the same global scale regardless of individual object rotations or scale.

It will also be 'stuck' to global position so moving the floor will result in the texture sliding across the surface. If that isn't desired you can apply scale and use the object vector.